Tribe Unlimited iCal Feed

gistfile1.txt

class UnlimitedICalFeed {
    public static function setup() {
        add_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ), 75 );
    }

    public static function pre_get_posts( WP_Query $query ) {
        if ( ! $query->tribe_is_event_query ) return self::shutdown();
        if ( ! isset($_GET['ical'] )  || 'all' !== $_GET['ical'] ) return self::shutdown();
        $query->set( 'posts_per_page', -1 );
    }

    protected static function shutdown() {
        remove_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ), 75 );
        return null;
    }
}

UnlimitedICalFeed::setup();